S3A_OL_1_EFR_1

OLCI/SENTINEL-3A L1 Full Resolution Top of Atmosphere Reflectance

Version 1eng

AbstractThe Ocean and Land Colour Instrument (OLCI) on board European Earth Observation satellite mission, SENTINEL-3, is a push-broom imaging spectrometer that measures solar radiation reflected by the Earth at a ground spatial resolution of 300m, over all surfaces, in 21 spectral bands. OLCI is based on the imaging design of ENVISAT's Medium Resolution Imaging Spectrometer (MERIS). It has a 1270km wide swath.
For more information about the instrument and the mission, visit "Sentinel Online" at https://sentinel.esa.int/web/sentinel/home
The OLCI Level-1B product, S3A_OL_1_EFR, is Level 1 full resolution (i.e. at native instrument spatial resolution - ~300m) Top of the Atmosphere Reflectance product. This is composed of an information package map, called a manifest, 22 measurement data files, and seven annotation data files. The 21 measurement data files (one for each band) Top Of Atmosphere (TOA) radiances, calibrated to geophysical units (W.m-2. sr-1 µm-1), georeferenced onto the Earth's surface, spatially resampled onto an evenly spaced grid. Seven annotation files information on illumination and observation geometry, environment data (meteorological data) and quality and classification flags. Both measurement data files and annotation data files are written in netCDF 4 format. The manifest file is in XML format and contains metadata associated with the instrument and the processing. The S3A_OL_1_EFR is generated in Earth Observation (EO) processing mode and all parameters in this product are provided for each re-gridded pixel on the product image and for each removed pixel.
The OL_1_EFR product package is described below:
Element name Description
Manifest.safe SENTINEL-SAFE product manifest
Oa##_radiance.nc Radiance for OLCI acquisition bands 01 to 21
Removed_pixels.nc Removed pixels information needed for Level-1C generation
Time_coordinates.nc Time stamp annotations
Geo_coordinates.nc High resolution georeferencing data
Quality_flags.nc Classification and quality flags
Tie_geo_coordinates.nc Low resolution georeferencing data
Tie_geometries.nc Sun and view angles
Tie_meteo.nc ECMWF meteorology data
Instrument_data.nc Instrument data
note: Oa## represents all the OLCI channels (Oa1 to Oa21).
For more information about the product, read the SENTINEL-3 OLCI User Guide at https://sentinel.esa.int/web/sentinel/user-guides/sentinel-3-olci.

Data Identification Fields:

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Data Dates

Creation

2016-08-01T00:00:00.000Z

Processing Level

1B

Quality

Quality information is provided in product metadata or check the data Sentinel-3 website.

Collection Progress

Planned

Use Constraints

The Sentinel-3A data is available publicly through LAADS Website at no cost to registered users who have agreed to the terms and conditions set by NASA and
the European Space Agency (ESA) to access the data.